Discussion
Home ‣ Mechanical Engineering ‣ Steam Nozzles and Turbines Comments
- Question
The stage efficiency (?S) is given by (where ?B = Blading efficiency, and ?N = Nozzle efficiency)
Options- A. ?S = ?B x ?N
- B. ?S = ?B/?N
- C. ?S = ?N/?B
- D. none of these
- Correct Answer
- ?S = ?B x ?N
- 1. The discharge is __________ at critical pressure.
Options- A. zero
- B. minimum
- C. maximum Discuss
- 2. In a reaction turbine, when steam flows through the fixed blades,
Options- A. pressure increases while velocity decreases
- B. pressure decreases while velocity increases
- C. pressure and velocity both decreases
- D. pressure and velocity both increases Discuss
- 3. The value of the reheat factor varies from
Options- A. 1.02 to 1.06
- B. 1.08 to 1.l0
- C. 1.2 to 1.6
- D. 1.6 to 2 Discuss
- 4. The reheat factor is the ratio of the
Options- A. cumulative heat drop to the isentropic heat drop
- B. isentropic heat drop to the heat supplied
- C. total useful heat drop to the total isentropic heat drop
- D. none of the above Discuss
- 5. The action of steam in a steam turbine is
Options- A. static
- B. dynamic
- C. static and dynamic
- D. neither static nor dynamic Discuss
- 6. The steam enters the nozzle at a
Options- A. high pressure and a low velocity
- B. high pressure and a high velocity
- C. low pressure and a low velocity
- D. low pressure and a high velocity Discuss
- 7. Which of the following statement is correct?
Options- A. The expansion of steam in a nozzle follows Rankine cycle.
- B. The friction in the nozzle increases the dryness fraction of steam.
- C. The pressure of steam at throat is called critical pressure.
- D. all of the above Discuss
- 8. In reaction turbines, the axial thrust is due to
Options- A. pressure drop across the rotor
- B. change in axial velocity
- C. both (a) and (b)
- D. none of these Discuss
- 9. The blade velocity coefficient is ratio of relative velocity of steam at outlet tip of the blade to the relative velocity of steam at inlet tip of the blade.
Options- A. True
- B. False Discuss
- 10. Parson's reaction turbine is a __________ reaction turbine.
Options- A. 40 percent
- B. 50 percent
- C. 60 percent
- D. 70 percent Discuss
Steam Nozzles and Turbines problems
Search Results
Correct Answer: maximum
Correct Answer: pressure decreases while velocity increases
Correct Answer: 1.02 to 1.06
Correct Answer: cumulative heat drop to the isentropic heat drop
Correct Answer: dynamic
Correct Answer: high pressure and a low velocity
Correct Answer: all of the above
Correct Answer: both (a) and (b)
Correct Answer: True
Correct Answer: 50 percent
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